package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    // 定义切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    // 定义通知
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        // 获取方法类型，根据类型进行不同的赋值，对于insert需要赋值4个，update需要赋值2个
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        // 获取到mapper中所传入的参数，也就是实体，
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0]; // 此处约定dao层的第一个参数为实体

        // 准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long id = BaseContext.getCurrentId();

        // 对实体进行赋值
        if (operationType == OperationType.INSERT) {
            try {
                // insert时候需要对4个公共属性进行赋值
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射为对象属性赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, id);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, id);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        } else if (operationType == OperationType.UPDATE) {
            try {
                // insert时候需要对2个公共属性进行赋值
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射为对象属性赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, id);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }


        log.info("公共字段自动填充完毕！");
    }
}
